Let there be no mistake about it. Many of the pictures that now routinely appear in print are no more than pictorial aids to reasoning, graphical sketches intended to suggest or persuade rather than ...

image: Dutch artist M.C. Escher's most famous drawing, ;Circle Limit IV (Heaven and Hell)', shows angels and demons in a tessellation that fills a circle without empty spaces. This masterful woodcut ...

Tessellation patterns that have fascinated mathematicians since Kepler worked out their systematics 400 years ago -- and that more recently have caught the eye of artists and crystallographers -- can ...

Maurits Cornelis Escher saw the world differently. The Dutch artist created a few dozen images that, because of his peculiar perspective, have endured. But many of those images — two hands drawing ...